Underfeed stoker.



- avenir.

l Stokers, of which .cation.

lzen of the United Jersey City, A State of New Jersey, have invented certain 'PAUL L. onown, oi` Jnfnsnr Cirie NEW JERSEY.

Unniinrnnn s'roKEn.

" Specification of Letters Patent.

Applicationled Oetober 5', 1907.; Serial No. 39G,91.

To allwiofm it may concern:

Be 1t known that I', PAUL L. Crown, aciti- States, and resident of in the county of Hudson and new anduseful Improvements in Underfeed the following is a specifi- This v invention relates to automaticicom- `bined underfeed .and overfeed stokers, and

the object isto providethis class of stokers with certain mechanical. -means of conveythe fuel to the .furnace and also in means V for agitating the same.

Another object is in the means of convey' j ing the air from the conduits or air chain-` bers into the burning mass.

'the dumping ash-grate.

l of a section of the furnace wall' diEerent sections,

Another object is" in means foroperating Another object isgin means for supplying air to the fuel chutes.- f f) 'Referring to the drawings: 'Figure lis a front view of a Afurnace'stoker my invention. Fig. 2'is a longitudinal sectional elevation. Fig. 3 isa side elevation mechanism for operating the pusher 'and dump grate. Fig. 4 is a detached cross secti'on of three of the fuel'chutes on line Y Y,

Fig. 2, the pushers therein being taken at and` one blower only I "shown, 5v is al Adetached cross section'of two of the nel chutes on lines Ya, Y, showing the flanges at the lower portion for unit-- ing them-together.- Fig. 6 is a perspective view showing part of two fuel chutes, .the Y section showing air'chamber and fastening means. Fig'. 7 is adeta'chedenlarged front view of' theashdumping grate mechanism.

Fig. 8 is a detached front View of two or moreblocks composing the a'r-ch.

Thefurnace 2 consists' of a combustion i chamber .3, a bridge wall 4, a boiler .5, and

munication is effected by forming a transversely disposed conduit- .17, belowv each,

embodying showing the Y chutet These conduits stantially the sa Ae ends of the chuiiis are assembled are formed at subsotliat when the chutes a continuous airv passage is formed the entire distance .across the vfurnace, providing for a distribution o f air from one air space to the remaining spaces.

. The bottom 'casing' of the air conduit is A cut away at intervals to form openings under each i chute over )which -is mounted a blower or fan I yfan rigidly ng along the bottom of the furnace, chutes and conduit,

and is driven by any motor.

Patented Nev. i5, ieio.

distance fromthe upper casingvl2. -In each is located-y mounted on a shaft 13 extend-- By this construction air is forced into the.

air passages. large through use of natural not in motion. l

The upper edges 7 a o f the fuel chutes support the twyer blocksS which are so formed that when in'position an opening 9 will be theA blowers to permit of the draft when thel blowers are leftv between, the lblocks andthe edgesof' 'the chutes. Each twyer block is provided with azcentral downwardly extending web,

the downwardly extending and Haring por- The air passages are 'made shaped `to .the inclined-'sides -of the chutes,

tionfof the web serving to retain them in position. Each chute has a pusher 18'. which is continuously tapered from its upper' or head portion. down to the lower end and this tapered portion of the pusherl onv its upper side is fiat, and on its under side is V shaped I to Conform morevreadily to the V .shape of the bottom of the chute, and also to 'permit said pusher to more easily move up'and down within said chute.

4 The object in forming thel pushers with continuous straight taper vis to lcause them to moreevenly distribute the'fuel in the chute,

and also to` more evenly breakl the crust of` the burning fuel. Each'pusher at the upper or head portion may be provided with ,a

projection 20, and'beyo'nd this point iteX- tends through an aperture outside the furnace.- The under side of the extended or,- tion is, provided with rack teeth ,land into the teethmesh thev shaft is operated by an ecentric 24 con',

pinion22 o n rocking shaft; 23. suitably mounted. This rocking nected to 'wheel 25mounted on stud 26 outjside the wall of furnace, and suitably driven by belt 28, over Wheel 25 and pulley 29 on blowershaft V13. v y

31 is the dump grate journaled 'on' shaft 32 which is supported on the flanges ofthe chutes. There is one grate to a chute. The

. lgrate lis locked up in position by the detent or do 33 pivoted tothe dump grate frame belowt e shaft 32.- The up er member of the dog is vformed at right ang es to .lit over and A agnn't l w ich when turned by the eccentric' or otherwise will raise or lower the dump. grate.

Over the vpushers within the chutes is placed T' the arch 52, mounted in the side walls of the" furnace. This'arch is c'omposed of bricks (see Figs. 2 and 8) which are on their lowerside slightly linclined upward and invward, vand also crown and flat shaped.: 1 5 vThis arch in connection with the pushers' the fuel `as it enters the aids the ignition of thereby hopper and-passes down the chute,

pro ucing smokeless combustion.

What/I 'claim is: `2'0 A .1 .j-The combination of a furnace, a plurality' similarly disposed fuel chutes mountedfwithin the furnace said chutes be- :.ingl- 'so constructed-and connected that in- ",'closed air spaces are formed between adja- 2'5 cent' chutes when they areassembled adapted to. provide a passageof air to the fuel acasing extending ltransversely beneath the chutes roviding communications between the' sai vair spaces,` the casing being provided lwith openings located between adj ai cent fuel .chutes and a separate fan mountedv on the casing delivering air to each of said openings.

, '-2. lThe combination of a'furnace' a plural ity of -fuel chutes mounted in said furnace "inclining from the `front to the rear, a reciprocating fuel pusher mountedto move 1n each ofjsaid chutes, each pusher tapered from its'u'pper to its lower end and means 40 forfeeding fuel to'the upper ends of the chutes.

3l In a furnace, similarly disposed fuel chutes, V-shaped in .cross section, mounted on an lncline 1n said furnace, pushers mount-.-

ed within said chutes, said pushers tapering from the upper to the lower end, and having a V-shaped under side which conforms to the V-shape of the chutes, and means for operating said pushers.

the square sidesofthe shaft 32,

ity of fuel chutes', havin an extended` upper through an aperture in said furnace rackmeer The combination of a furnace, a plurality of fuel chutes mounted within -said furnace incliningifrom'the frontto the-rear,

said chutes each havingv flanges' provided with 4openings for receiving bolts tosecure said chutes together, a shafttmounted on-the flanges of 'said Ychutes, av dum naled on. said shaft,said1sha having at sides detent or dog ivot'ed on said dump plate below. the said s aft, said dog having a right angle portion, said rightangle p0rtion adapted to fit over and against the flat sides of said shaft, and means for operating said shaft.--

5. The combination ofv a furnace,a pluralapertures, said chutes-mounted insaid rnace incliningfrom `Ithe front to the rear, a reciprocating fuel pusher mounted to move in each of the chutes' each pusher tapered from itsupper` toitslowerend, each vpusherprovided with portion extending teeth formed on the-underside ofthe pro jectingportion of said pusher a shaft said shaft 'mounted on` said chutes, a pinion mounted on said shaft, said pinion provided with teeth adapted to mesh into the lrack teeth of 'the' said pusher and means for' rocking said shaft..

6.' The combination of a furnace, a plural- 'ity of inclined fuel chutes mounted in said furnace, each of said chutes provided with {ian-ged plates'fqrming air casings between the chutes and aconnecting passage between the said casings when the chutes are as sembIe'd, means for connecting the anges,

City, in county of 

